JP3554580B2 - Discharge chute of powder material compression molding equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an improvement of a discharge chute in a powder material compression molding apparatus.
In particular, the present invention is directed to guiding a small-diameter cylindrical naked tablet (a cylindrical naked tablet having a diameter of 4 to 6 mm) formed by a rotary tableting machine to other devices such as a powder removing machine and subsequent processes. The present invention relates to a discharge chute of a suitable powder material compression molding apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, it has been known to manufacture a compact (tablet) using a powder material compression molding apparatus such as a rotary tableting machine (see, for example, JP-A-60-248225).
As shown in FIG. 6, the powder material compression molding apparatus comprises a pair of a cylindrical vertical molding die 101 and a pair of upper and lower punches (upper punch 102, lower punch 103) that move up and down. As shown in FIG. 7, the sets (usually about 30 sets) are vertically arranged at regular intervals on a constant circumference of the turntable 104, and the dies 101 are sequentially rotated while the turntable 104 makes one rotation. It is configured to pass through a powder filling area A, a powder overflow area B, a powder compression molding area C, and a compact discharge position D.
[0003]
The upper punch 102 and the lower punch 103 that move up and down rotate together with the corresponding dies 101, and the inner upper punch 102 is vertically guided by an upper orbital means (not shown) and moves up and down. When it is in the powder filling area A and the powder overflow area B, it is located above the dies 101 and separated from the dies 101, and falls when the dies 101 reach the powder compression molding area C, and is filled in the dies 101. It is configured to apply a constant pressure to the powder that has been formed, and configured to rise away from the die 101 at the compact discharge position D.
[0004]
On the other hand, the lower punch 103 exists in a state where it is fitted into the mill 101 in all areas. When the mill 101 is in the powder filling area A, it is at a large volume position X located below the mill 101.
When the mill 101 comes into the powder overflow area B, the lower punch 103 is moved up at a constant speed by the lower track guide means (not shown), and moves from the large volume position X to the fixed volume position Y located above the large volume position X. It is displaced (see FIG. 6).
[0005]
Further, when the dies 101 come to the powder compression molding area C, the lower punch 103 is located at a fixed volume position Y in the dies 101 and cooperates with the upper punch 102 to apply a certain amount of powder filled in the dies 101. It is configured to apply pressure.
When the lower punch 103 reaches the molded body discharge position D, the lower punch 103 is further raised and displaced to the upper opening position Z of the die 101 (see FIG. 6) so that the molded body (tablet) is discharged from the die 101. Is configured.
[0006]
In the powder filling area A, the powder material is filled into the die 101 from the powder material supply means 105 installed above the turntable 104, and the die 101 passes through the powder overflow area B and the powder compression molding area. Before entering C, the scraping plate 106 arranged above the turntable 104 in contact with the upper opening surface of the mill 101 is configured to remove excess powder material overflowing from the mill 101. .
Further, at the molded body discharge position D, there is provided a take-out plate 108 for feeding a molded body (tablet) projecting from the upper opening of the die 101 to the discharge port 107.
[0007]
The compact (tablet) discharged from the conventionally known powder material compression molding apparatus configured as described above is usually an ancillary facility for removing powder and the like attached around the compact (tablet). It is guided to a powder removing machine 109 via a discharge chute 110.
The discharge chute 110 is provided with a discharge port 107 of the powder material compression molding apparatus at an inclination angle of 20 to 30 degrees and the above-described powder removing machine 109 as an auxiliary facility so that the molded body (tablet) slides down by its own weight. (See FIG. 7).
[0008]
[Problems to be solved by the invention]
The above-described powder material compression molding apparatus includes the vertical molding dies 101 arranged at regular intervals on a constant circumference of the turntable 104, and a pair of upper and lower punches (upper punch 102, lower punch 103) moving up and down. By changing these to various shapes, it is possible to form, for example, a molded product having a large diameter of 10 mm or more (normal tablet) to a mini tablet having a diameter of 4 to 6 mm. In addition, the shape thereof may be a sphere, an ellipse, a column having a flat upper and lower surface, or the like.
[0009]
By the way, when the compact (tablet) discharged from the powder material compression molding apparatus is a heavy compact having a large diameter or a sphere or an ellipsoid having a small slip resistance among the compacts described above, Or when it is slippery like a sugar-coated tablet, the discharge chute 110 for guiding the molded body to the powder removing machine 109 functions normally, and the molded body slides down on the discharge chute 110 and is placed on the discharge chute 110. It is unlikely to stay.
However, when the molded body is a column-shaped naked tablet having a diameter of, for example, 4 to 6 mm, the flow of the molded body on the discharge chute 110 is caused by friction between the surface of the discharge chute 110 and the surface of the molded body (naked tablet). Stagnation, and the molded article was sometimes clogged.
[0010]
In order to solve this inconvenience, it is first conceivable to further increase the inclination angle (the inclination angle of 20 to 30 degrees) of the discharge chute 110. However, in order to carry out such a method, a major change of existing equipment is required. When a large-diameter molded product or the like is flowed using the steep discharge chute 110 having a steep slope, the molded product may jump out of the opening of the powder removing machine 109 due to excessive acceleration, or may be removed. There is a fear that the compact may be chipped due to collision with the opening of the powdering machine 109.
[0011]
Further, a method for improving the slip of the molded body by plating or applying a synthetic resin film having self-lubricating properties to the sliding surface of the molded body of the discharge chute 110 has been proposed and partially put into practical use. Although the sliding of the molded body itself can be improved to some extent, the flat sliding surface cannot reduce the contact area with the molded body, and cannot greatly reduce the sliding resistance. However, there is a problem that the powder adhering to the periphery of the compact gradually accumulates on the sliding surface and hinders the sliding of the compact.
[0012]
In general, as a method of flowing a molded body smoothly on an inclined plate body, this plate body is made into a perforated plate, and air is blown from below the porous body, so that the molded body is slightly floated. It has been practiced to "reduce the contact area with the material" to greatly reduce the sliding resistance. However, such a method is expensive and adapted to the discharge chute of the powder material compression molding apparatus to which the present invention is applied. In such a case, the powder or the like adhering to the periphery of the molded body is wound up by air and becomes dust, so that its use is difficult.
[0013]
The present invention has been made in view of the actual situation of the discharge chute of the powder material compression molding apparatus described above, and its purpose is to be easily applicable to existing equipment, and moreover, the powder adheres to the periphery thereof. It is an object of the present invention to provide a discharge chute of a powder material compression molding apparatus capable of smoothly dropping various compacts under special circumstances.
[0014]
It is another object of the present invention to provide a discharge chute of a powder material compression molding apparatus capable of "reducing the contact area with a compact" and greatly reducing the sliding resistance of the compact.
In particular, an object of the present invention is to provide a small-sized column-shaped nadaka tablet (4 to 6 mm) without changing the inclination angle (the inclination angle of 20 to 30 degrees) of the discharge chute of the existing powder material compression molding apparatus. The present invention aims to provide a discharge chute that can smoothly guide a column-shaped naked tablet having a diameter of 1) to another device such as a powder remover or a subsequent process.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is characterized in that the upper surface of the discharge chute has a wave shape in which valleys and peaks are continuous in parallel with the inclination direction of the discharge chute.
[0016]
That is, the present invention
"A discharge chute of a powder material compression molding device inserted downwardly between the compression molding device and the auxiliary equipment in order to guide the compact discharged from the powder material compression molding device to the auxiliary equipment. At
(1) that the running surface of the shaped body of the outlet chute, and an inclination direction parallel to wave shape troughs and crests with the pitch width of 1~5mm is contiguous, or,
(2) A self-lubricating synthetic resin member on the sliding surface of the molded body of the discharge chute, in which valleys and peaks are continuous with a pitch width of 1 to 5 mm in parallel with the inclination direction of the discharge chute. Mounting a member having a wavy upper surface,
The discharge chute of the powder material compression molding apparatus characterized by the above. "
Is the gist.
[0017]
As the “synthetic resin having self-lubricating property” of the above (2) according to the present invention , Teflon ( registered trademark) or polyethylene is preferable.
Further, in the present invention, it is preferable to apply the present invention to an apparatus in which the powder material compression molding apparatus is a “rotary tableting machine” and the auxiliary equipment connected to the compression molding apparatus is a “pulverizer”. Further, it is preferable to apply the present invention to a device in which the compact discharged from the powder material compression molding apparatus is a "cylindrical tablet having a diameter of 4 to 6 mm".
[0018]
[Action]
According to the discharge chute of the powder material compression molding apparatus according to the present invention described above, the compact flowing on the chute flows in a state of line contact with the peak of the corrugated sliding surface, so that the sliding is performed. The resistance is greatly reduced, and an effect is obtained in which molded articles of various shapes or sizes can be smoothly dropped while maintaining the inclination angle (20 to 30 degrees) of existing equipment.
[0019]
Further, even when the powder attached to the periphery of the molded body is separated during the fall, the separated powder is guided to the valley of the discharge chute according to the present invention, and falls to the incidental equipment, It does not hinder the flow of the compact.
Therefore, there is an effect that the compact discharged from the powder material compression molding apparatus in a special situation where the powder is adhered to the surroundings can be smoothly guided to the incidental equipment without generating dust. .
[0020]
Further, in the present invention, a self-sliding synthetic resin member having a wave-shaped upper surface in which valleys and peaks are continuous with the inclination direction of the discharge chute is mounted on the sliding surface of the discharge chute. Will be in line contact with the self-lubricating synthetic resin, and the flow will be smoother, and the improvement work will be completed simply by attaching the above members to the existing discharge chute, so that existing equipment The application becomes extremely easy.
[0021]
Furthermore, in the present invention in which the wave shape of the sliding surface of the discharge chute is a wave shape in which valleys and peaks are continuous with a pitch width of 1 to 5 mm, the diameter of 4 to 6 mm, which was extremely difficult to fall, was Even with a column-shaped naked insert, it can be dropped smoothly with the inclination angle of existing equipment.
[0022]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a conceptual plan view showing a rotary tableting machine to which a discharge chute according to the present invention is applied and a powder removing machine attached to the tableting machine. FIG. 2 shows an example of a discharge chute according to the present invention. FIG. 3 to 5 are cross-sectional views showing examples of the discharge chute according to the present invention.
[0023]
In FIG. 1, reference numeral 1 denotes a rotary tableting machine. The rotary tableting machine 1 has a tableting means 2 composed of a cylindrical vertical molding die and a pair of upper and lower punches.
A plurality of sets of the tableting means 2 are arranged at a constant interval on a fixed circumference of the turntable 3, and the tableting means 2 is sequentially turned into the powder filling area A and the powder while the turntable 3 makes one rotation. The molded body W (see FIG. 2) is formed by passing through the overflow area B and the powder compression molding area C, and is formed at the molded body discharge position D by the ejection plate 4 installed in the tableting machine 1 to the discharge port 5. This is a conventionally known powder material compression molding apparatus having a structure for continuously feeding W.
[0024]
Then, the compact W discharged from the powder material compression molding apparatus has an upper opening 7 of a powder removing machine 6 which is an auxiliary facility for removing the powder V (see FIG. 2) attached around the compact W. Is guided through the discharge chute 8.
The discharge chute 8 is formed at an inclination angle of 20 to 30 degrees so that the compact W slides down by its own weight, and is connected to the discharge port 5 of the powder material compression molding apparatus and the upper opening 7 of the powder removing machine 6 which is an incidental facility. Has been passed between.
[0025]
On the sliding surface 8a of the molded body W of the discharge chute 8, a valley a and a crest b formed of a synthetic resin having self-sliding property as shown in FIG. A member 9 having a wave-shaped upper surface in which is connected is mounted.
In FIG. 2, in order to clearly show that the corrugated member 9 is to be mounted on the sliding surface 8 a, the sliding surface 8 a is illustrated as being partly separated from the member 9.
[0026]
As the material of the synthetic resin member 9 having self-lubrication, any material having self-lubrication can be used.
Although not limited by the present invention, Teflon or polyethylene is particularly preferable among materials having self-lubrication. Teflon is particularly preferable because it has high chemical resistance and its surface is smooth even if it is scratched, and polyethylene is particularly preferable because it is easy to process and inexpensive.
[0027]
Further, it is preferable that the wave shape formed on the upper surface of the member 9 be a wave shape in which the valleys a and the peaks b are continuous with the pitch width of 1 to 5 mm in parallel with the inclination direction of the discharge chute 8.
If the pitch width is less than 1 mm, the frictional force increases in the large-diameter tablet. If the pitch is more than 5 mm, the small tablet enters the valley a, and as a result, the frictional force also increases. And fall off smoothly.
[0028]
According to the discharge chute 8 configured as described above, the compact W flowing down on the corrugated member 9 is in line contact with the peak b of the corrugated sliding surface as shown in FIG. 3 or FIG. In this state, the molded body W slides down, and the sliding resistance is greatly reduced. Therefore, the molded body W can be smoothly dropped while keeping the existing equipment at an inclination angle (20 to 30 degrees).
FIG. 3 shows an example in which the shape of the peak b of the corrugated member 9 is an acute angle, and FIG. 4 shows an example in which the corrugated portion is rounded, and each is suitable as the corrugated member 9 according to the present invention.
[0029]
Further, even if the powder V adhered to the periphery of the molded body W comes off during the fall of the molded body W, as shown in FIG. 3 or FIG. However, since this falls into the upper opening 7 of the powder removing machine 6 due to the vibration of the tableting machine, the flow of the compact W is not obstructed.
[0030]
In the above-described embodiment, the member 9 having a wavy upper surface in which the valleys a and the ridges b are formed in parallel with the inclination direction of the discharge chute is formed by sliding the existing discharge chute 8 with the self-lubricating synthetic resin. Since the molded body W is mounted on the surface 8a, the molded body W comes into line contact with the synthetic resin having self-slip properties, so that the flow becomes smoother and the application to existing equipment becomes extremely easy.
[0031]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. is there.
For example, in the above-described embodiment, the separate member 9 is mounted in order to make the sliding surface 8a of the discharge chute 8 corrugated. It may have a sliding surface of a shape.
[0032]
Further, the discharge chute 8 shown in the above embodiment has two examples in which the cross section has a wavy shape (FIGS. 3 and 4), but the waveform of all shapes that can reduce the contact area with the formed body, for example, As shown in FIG. 5, a plurality of elongated triangular members 52 may be adhered to the sliding surface 51a of the discharge chute 51 in parallel with the inclined direction to form a wave shape in which the valleys a and the ridges b are continuous. , Which are also included in the present invention.
[0033]
【The invention's effect】
As described in detail above, according to the discharge chute of the powder material compression molding apparatus according to the present invention, various discharge pipes can be easily applied to existing equipment, and are in a special situation where powder is adhered to the periphery thereof. This produces an effect that the molded body can be dropped smoothly.
In particular, according to the present invention, a small-diameter cylindrical nadaka tablet (a cylindrical nadaka tablet having a diameter of 4 to 6 mm) formed by a rotary tableting machine does not stay on a discharge chute, and a powder removing machine is used. And other devices, or a subsequent process, can be smoothly led to a remarkable effect.
[Brief description of the drawings]
FIG. 1 is a conceptual plan view showing a rotary tableting machine to which a discharge chute according to the present invention is applied and a powder removing machine attached to the tableting machine.
FIG. 2 is a perspective view showing an example of a discharge chute according to the present invention.
FIG. 3 is a cross-sectional view showing an example of a discharge chute according to the present invention.
FIG. 4 is a cross-sectional view showing another example of the discharge chute according to the present invention.
FIG. 5 is a cross-sectional view showing still another example of the discharge chute according to the present invention.
FIG. 6 is a conceptual sectional view showing tableting means in a conventional rotary tableting machine.
FIG. 7 is a conceptual plan view showing a conventional rotary tableting machine using a discharge chute and a powder removing machine attached to the tableting machine.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rotary tableting machine 2 tableting means 3 turntable 4 take-out plate 5 discharge port of rotary tableting machine 6 powder removal machine 7 upper opening of powder removal machine 8 discharge chute 8a sliding surface of discharge chute 9 Synthetic resin member A having powder filling area B powder overflow area C powder compression molding area D molded body discharge position a corrugated valley b corrugated crest W molded body V powder 101 cylindrical vertical molding die 102 Upper punch 103 Lower punch 104 Turntable 105 Powder material supply means 106 Scraper plate 107 Discharge port 108 Extraction plate 109 Powder remover 110 Discharge chute

Claims (5)

In order to guide the molded body discharged from the powder material compression molding device to the auxiliary equipment, in a discharge chute of the powder material compression molding apparatus which is inserted in a state inclined downward between the compression molding apparatus and the auxiliary equipment, A discharge chute for a powder material compression molding apparatus, characterized in that a sliding surface of the molded body of the discharge chute has a wavy shape in which valleys and ridges are continuous with a pitch width of 1 to 5 mm in parallel with an inclination direction. In order to guide the molded body discharged from the powder material compression molding device to the auxiliary equipment, in a discharge chute of the powder material compression molding apparatus which is inserted in a state inclined downward between the compression molding apparatus and the auxiliary equipment, A sliding surface of the molded body of the discharge chute, which is a synthetic resin member having self-sliding property, and has a wavy shape in which valleys and peaks are continuous with a pitch width of 1 to 5 mm in parallel with the inclination direction of the discharge chute. A discharge chute for a powder material compression molding apparatus, comprising a member having an upper surface. The discharge chute according to claim 2, wherein the self-lubricating synthetic resin is Teflon or polyethylene. The powder material according to any one of claims 1 to 3, wherein the powder material compression molding device is a rotary tableting machine, and ancillary equipment connected to the compression molding device is a powder removing machine. Discharge chute of compression molding equipment. The compact according to any one of claims 1 to 4, wherein the compact discharged from the powder material compression molding device is a cylindrical naked tablet having a diameter of 4 to 6 mm. Discharge chute.

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